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Carbon Steel Caps 1.Material:A234-WPB.A420-WPL6.A234-WP12.A234-WP11.A234-WP5.A403-WP304.A403-WP304L.A403-WP316.A403-WP316L Carbon steel:20# A3 Q235A 20G 16Mn ASTM A234 ect 2.Standard:ISO,SNSI,JIS,DIN...